This interaction automatically establishes an authenticated stream
using the CRAM-MD5 method.

If you wish to turn off additional encryption in SASL when STARTTLS
is already encrypting the communication, you do so by defining this
AuthMaxBits option. When set, this option limits
the maximum encryption strength for the security layer in SMTP AUTH.
When not set (the default) encryption strength is essentially
unlimited. The AuthMaxBits option is used like
this:

Here, limit is the maximum number of bits in the
keylength. The existing encryption strength is taken into account
when choosing an algorithm for the security layer. For example, if
STARTTLS is used and the symmetric cipher is DES, the keylength (in
bits) will be 168. By setting this option to:

define(`confAUTH_MAX_BITS', `168')

any encryption in SASL will be disabled.

The AuthMaxBits option is not safe. If specified
from the command line, it can cause sendmail to
relinquish its special privileges.